From bf704a0b303bdef2e2e8cb0eb768286e3617a60c Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Wed, 12 Apr 2023 22:52:05 -0300
Subject: avformat/concatf: check if any nodes were allocated

Fixes ticket #10304

Signed-off-by: James Almer <jamrial@gmail.com>
(cherry picked from commit 19c2dc677f81c940aebe63ed09dacf5c725f0b35)
---
 libavformat/concat.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/concat.c b/libavformat/concat.c
index dc0985e40c..825e43a7fa 100644
--- a/libavformat/concat.c
+++ b/libavformat/concat.c
@@ -296,6 +296,8 @@ static av_cold int concatf_open(URLContext *h, const char *uri, int flags)
     av_bprint_finalize(&bp, NULL);
     data->length = i;
 
+    if (!data->length)
+        err = AVERROR_INVALIDDATA;
     if (err < 0)
         concat_close(h);
 
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